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t in (-oo:+oo)
t^2-((12*t)/27) = 0
t^2+(-4/9)*t = 0
t^2-4/9*t = 0
DELTA = (-4/9)^2-(0*1*4)
DELTA = 16/81
DELTA > 0
t = ((16/81)^(1/2)+4/9)/(1*2) or t = (4/9-(16/81)^(1/2))/(1*2)
t = 4/9 or t = 0
t in { 0, 4/9 }
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